🎉 Source Zendesk Chat: make Chats stream incremental + add tests for all streams

[Zirochkaa]

What

Closes #7733.

🚨 User Impact 🚨

Are there any breaking changes? If yes, please make sure to include it here and in any changelogs with the 🚨🚨 emoji
What is the end result perceived by the user?

Pre-merge Checklist

• Community member? Grant edit access to maintainers (instructions)
• Secrets in the connector's spec are annotated with airbyte_secret
• Unit & integration tests added and passing. Community members, please provide proof of success locally e.g: screenshot or copy-paste unit, integration, and acceptance test output. To run acceptance tests for a Python connector, follow instructions in the README. For java connectors run ./gradlew :airbyte-integrations:connectors:<name>:integrationTest.
• Code reviews completed
• Documentation updated
  • Connector's README.md
  • Connector's bootstrap.md. See description and examples
  • docs/SUMMARY.md
  • docs/integrations/<source or destination>/<name>.md including changelog. See changelog example
  • docs/integrations/README.md
  • airbyte-integrations/builds.md
• PR name follows PR naming conventions

[Zirochkaa]

/test connector=source-zendesk-chat

🕑 source-zendesk-chat https://github.com/airbytehq/airbyte/actions/runs/1488694263
✅ source-zendesk-chat https://github.com/airbytehq/airbyte/actions/runs/1488694263
Python tests coverage:

	 ---------- coverage: platform linux, python 3.8.10-final-0 -----------
	 Name                                                 Stmts   Miss  Cover
	 ------------------------------------------------------------------------
	 source_acceptance_test/__init__.py                       2      0   100%
	 source_acceptance_test/base.py                          10      4    60%
	 source_acceptance_test/config.py                        75      8    89%
	 source_acceptance_test/conftest.py                     108    108     0%
	 source_acceptance_test/plugin.py                        47     47     0%
	 source_acceptance_test/tests/__init__.py                 4      0   100%
	 source_acceptance_test/tests/test_core.py              200     94    53%
	 source_acceptance_test/tests/test_full_refresh.py       38     27    29%
	 source_acceptance_test/tests/test_incremental.py        69     38    45%
	 source_acceptance_test/utils/__init__.py                 6      0   100%
	 source_acceptance_test/utils/asserts.py                 37      2    95%
	 source_acceptance_test/utils/common.py                  41     24    41%
	 source_acceptance_test/utils/compare.py                 62     25    60%
	 source_acceptance_test/utils/connector_runner.py        82     49    40%
	 source_acceptance_test/utils/json_schema_helper.py     115     14    88%
	 ------------------------------------------------------------------------
	 TOTAL                                                  896    440    51%
	 ---------- coverage: platform linux, python 3.8.10-final-0 -----------
	 Name                                       Stmts   Miss  Cover
	 --------------------------------------------------------------
	 base_python/__init__.py                       13      0   100%
	 base_python/catalog_helpers.py                10      6    40%
	 base_python/cdk/__init__.py                    0      0   100%
	 base_python/cdk/abstract_source.py            83     59    29%
	 base_python/cdk/streams/__init__.py            0      0   100%
	 base_python/cdk/streams/auth/__init__.py       0      0   100%
	 base_python/cdk/streams/auth/core.py           8      1    88%
	 base_python/cdk/streams/auth/jwt.py            5      5     0%
	 base_python/cdk/streams/auth/oauth.py         37     26    30%
	 base_python/cdk/streams/auth/token.py          9      4    56%
	 base_python/cdk/streams/core.py               63     32    49%
	 base_python/cdk/streams/exceptions.py         10      2    80%
	 base_python/cdk/streams/http.py               67     33    51%
	 base_python/cdk/streams/rate_limiting.py      30     14    53%
	 base_python/cdk/utils/__init__.py              0      0   100%
	 base_python/cdk/utils/casing.py                4      0   100%
	 base_python/client.py                         56     33    41%
	 base_python/entrypoint.py                     70     56    20%
	 base_python/integration.py                    52     25    52%
	 base_python/logger.py                         33     19    42%
	 base_python/schema_helpers.py                 56     41    27%
	 base_python/source.py                         51     34    33%
	 main_dev.py                                    3      3     0%
	 --------------------------------------------------------------
	 TOTAL                                        660    393    40%
	 ---------- coverage: platform linux, python 3.8.10-final-0 -----------
	 Name                              Stmts   Miss  Cover
	 -----------------------------------------------------
	 main_dev.py                           6      6     0%
	 source_zendesk_chat/__init__.py       2      2     0%
	 source_zendesk_chat/source.py        18     18     0%
	 source_zendesk_chat/streams.py      145    145     0%
	 ---------- coverage: platform linux, python 3.8.10-final-0 -----------/actions-runner/_work/airbyte/airbyte/airbyte-integrations/connectors/source-zendesk-chat/.venv/lib/python3.8/site-packages/coverage/control.py:761: CoverageWarning: No data was collected. (no-data-collected)
	 -----------------------------------------------------
	 TOTAL                               171    171     0%

[Zirochkaa]

/publish connector=connectors/source-zendesk-chat

🕑 connectors/source-zendesk-chat https://github.com/airbytehq/airbyte/actions/runs/1490660783
✅ connectors/source-zendesk-chat https://github.com/airbytehq/airbyte/actions/runs/1490660783